One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,6)(3,7,8,5)(11,15)(14,16)(17,18)(19,27)(20,26)(21,24)(22,25)(23,29)(28,32)(30,31)(1,3,4,8)(2,5,6,7)(9,10)(11,14)(12,13)(15,16)(19,28)(23,31)(27,32)(29,30)(10,13)(14,16)(17,19)(18,23)(20,29)(21,30)(22,28)(24,27)(25,31)(26,32) involution — undirected(10,13)(14,16)(17,20,22,21)(18,24,25,26)(19,29,28,30)(23,27,31,32)(9,11,12,15)(10,14,13,16)(18,25)(23,31)(24,26)(27,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.